In the modern automotive industry, extensive use of spot-welding in the body, the solder joint failure is the main reason leading to vehicle failure.
在现代汽车工业中，点焊广泛运用在车身中，焊点失效是导致车身失效的主要原因。
Analyse the failure modes and mechanism of the mixed solder joint, and introduce the effect factors of reliability ulteriorly.
对混合焊点的失效形式和混合焊点的失效机理进行了分析，并进一步介绍了影响这类焊点可靠性的因素。
The study about board level drop impact shows that: (1) The mechanical impact and bending of PCB are the main reasons which induce the solder joint stress even the drop failure;
研究结果表明，在跌落冲击条件下：（1）PCB的机械冲击和弯曲变形是导致焊点应力甚至跌落失效的主要原因；
The study about board level drop impact shows that: (1) The mechanical impact and bending of PCB are the main reasons which induce the solder joint stress even the drop failure;
研究结果表明，在跌落冲击条件下：（1）PCB的机械冲击和弯曲变形是导致焊点应力甚至跌落失效的主要原因；
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